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authorMat Martineau <mathewm@codeaurora.org>2012-05-04 14:20:31 -0700
committerGustavo Padovan <gustavo.padovan@collabora.co.uk>2012-05-16 16:14:02 -0300
commita6a5568c03c4805d4d250f6bd9d468eeeb4ea059 (patch)
treea85da07516e3c584056373fbad175a3757040b5c /net/bluetooth/l2cap_sock.c
parentef191aded58c5e6860b01f463818584a420a4d6b (diff)
downloadlinux-a6a5568c03c4805d4d250f6bd9d468eeeb4ea059.tar.bz2
Bluetooth: Lock the L2CAP channel when sending
The ERTM and streaming mode transmit queue must only be accessed while the L2CAP channel lock is held. Locking the channel before calling l2cap_chan_send ensures that multiple threads cannot simultaneously manipulate the queue when sending and receiving concurrently. L2CAP channel locking had previously moved to the l2cap_chan struct instead of the associated socket, so some of the old socket locking can also be removed in this patch. Signed-off-by: Mat Martineau <mathewm@codeaurora.org> Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
Diffstat (limited to 'net/bluetooth/l2cap_sock.c')
-rw-r--r--net/bluetooth/l2cap_sock.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index b7bc7b981ee2..f6d8e13197d6 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -720,16 +720,13 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
- lock_sock(sk);
-
- if (sk->sk_state != BT_CONNECTED) {
- release_sock(sk);
+ if (sk->sk_state != BT_CONNECTED)
return -ENOTCONN;
- }
+ l2cap_chan_lock(chan);
err = l2cap_chan_send(chan, msg, len, sk->sk_priority);
+ l2cap_chan_unlock(chan);
- release_sock(sk);
return err;
}
@@ -940,7 +937,10 @@ static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
struct sk_buff *skb;
int err;
+ l2cap_chan_unlock(chan);
skb = bt_skb_send_alloc(chan->sk, len, nb, &err);
+ l2cap_chan_lock(chan);
+
if (!skb)
return ERR_PTR(err);